Door-check.



J. J. DALY.

DGOR CHECK.

APPLICATION FILED IIov. 22,1913.

Patented July 7,1914.

I I I 'I Il/ m WI ff 0 JOHN a. DALY, or NEW nnunswrcx, NEW JERSEY, assrerivoia 'ro EDWARD W. Mccnmy, or NEW YORK, n. Y.

noon-CHECK.

incarna., y

l Specification of Letters Patent.

Patented July 7, 1914.

application inea November 22, 191s. serial ne. 802,346.

Be' it known that I, JOHN J.. DALY, a citizen oflthe United States, residing at New Brunswick, in the county of Middlesex and I State@ 0f New Jersey, have invented certain "new and useful .Improvements in Door- Checks, of which the following is a full, clear, and exact description.v

rllhis Vinvention relates to door checks and more particularly to the type of 'check which comprises a cylinder having a piston therein which is inserted in the door frame; a member fastened to the edge of the door which abuts the frame when the door is closed; a single link pivotally connected to the door and member respectively; and a spring-1n the cylinder acting against the piston and correlative parts to close the door, which movement is retarded by restricting the es# capeof air trapped in the cylinder to the rear of the piston. v

"One object of m invention is to provide a door check of t is character which will j permit the door to be fully opened and will continually exert a tension'on the door to close it even when it is in its fully opened position.

. Another' object ofmy invention is to pro- A lvide a check which .is automatically adji'istable for doors and door frames of di'erent sizes. Withthese and otherV objects in View, vmy

invention consists of forming a projecting lug on the member fastened to the door and connecting this lug Ato t-he piston-rod by a link of suflicient length to permit the door to fully open, that is, to a position in which the vedge of the door lies in substantially the same-plane asthel face of the frame; ythe projecting lug extending beyond. the edge of the dooraI distance suflicient-to maintain the link at an 'obtuse angle to the piston-rod .when the door is in its fully open position,

sothat the tension exerted by the spring on the piston-rod -will act on the lug through the connecting link. Ito rotate `the door to its closed position, which movement is facilitated by the leverage obtained on the door by using a lug which projects a considerable distance beyond the axis of the hinges thereof.

My invention also contemplates making the connecting link of resilient material so that it will adjust itself to the various sizes used.

In the drawings: Figure 1 is a vertical central section thro-ugh a form of door check i y cmbodyin 4 the features of my invention., a

portion o the door frame also being yshown in section; Fig. y2 is a central horizontal section through one of the cylinders of the check; Fig. 3 is a view similar to Fig. 2 but showing the door in its fully open position.

The device is adapted to be attached'to the ordinary form of door frame or jamb l and a door 2 which is mounted on the frame by hinges. 3. Insert-ed in a rectangular recess perpendicular tothe face of the door frame is a casing 4 whose outer face is substantially flush with the face of the door l frame, the casing providing duplicate cylinders 6 separated by an intermediate wall 5. f Pistons 7 having piston-rods 8 integral l"therewith are located in each of the cylinders, the pistons serving as a backing for the cup-shaped packingl disks 9 of leather or other fiexible material which are held against the pistonsI by washers and nuts threaded on the reduced ends of the same.

These packing disksprevent the escape of air between the peripheral edge of the piston and the walls of the cylinder upon rearward movement of the pistons, and are utilized to retard thev rearward movement of the piston as will hereinafter be referred to.

Internal collars 10 are located in the cylinclose the same through the connections which will now be described.

Inset in the edge of the door 2 with its outer face substantially Hush therewith, is a plate 14. This plate has lugs or projecting members 15 arranged-thereon so that when the door is in its closed position, the lugs or projecting members will enter the open ends of the cylinders 6 as is shown in Figs. l and 2, The lugs 15 project a considerable distance beyond the edge of the door for-'a purpose which Will be fully brought out in the operation of thev device. A single link 16 connects each of the piston-rods 7 andthe lugs l5, and in my preferred construction, this link comprises a tightly coiled spring of less resiliency than the resiliency of the spring 12, and which Will not be placed under tension until the spring 12 hasl been -fully compressed. This springv is fas.

tened to the lugs 15 and the piston-rod 8 by 'bending the ends of the s rings Aaround rollers 17 carried b pins 17 riven through the endsV of the ro and lugs,respectively, which are referably slotted forrthe recep tion of the ent ends of the springs.

Where the door check is tobe used with doors and 'door frames of various sizes, a connecting link, which consists of the tightly coiled spring 16, is preferable, for if the,

length of this spring should not be sufficient to permit the door to fully open, then it is evident that after the spring 12 has been fully compressed and thev end of the piston-rod 7 projects beyond the face'of the casing, as shown in `Fig. 3, the coiled spring 16 will then be stretched suliciently to permit the movement of the door vto its Widest possible position, the collar 10 form ing a bearing for the -rodl to prevent it from tilting.

In fastenmg a door check of this kind to" the door, it is preferable to do sowherrthe door is 1n a partially open position, so that the coiled spring 16 will not be under tene sion and the check may thenibe secured to the door in the same way as yif a rigid link were used. It'may also 'here be noted thatI the rear ends of the cylinders and are'connected to a common conduit '19 extending through the intermediate wall 5to the front of the casing. The passage of air throughl these conduits is controlled by a screw-plug 20 threaded into an enlarged end of the conduit 19, the coned end of theplug being adjustable with respect to a` seat 21. The air which is trapped in the cylinders escapes around this seat and through a longitudinal slot 22 cut in the periphery of the plug.

The operation of the device is as follows Assuming that the door is in its closed position, as shown in Figspl and 2,

and it is then fully opened to the position shownin Fig. 3. This movement of the I door will draw the piston 7 and piston-rod i I 8 forwardly inthe cylinder against the action of the spring 12 until this spring is fully compressed and the end of the piston-` rod projects-slightlybeyond the outer face? of the casing. During this movement of the piston-rod, the spring orresilient link 16^'| 'I "75. swing outwardly tofollow the movement of@- -gthe lug 15.l This angularl movement of the link is at first slight due to the length of.. j the lug 1 5, so that the linkI will leave the* will move forwardly and simultaneously casing Without binding against the collar 10 or the outer edge of the casing. As thedoor approaches its fully open position, this angular movement is increased, but the link will have by this time advanced suiiiciently in the cylinder to permit the 'rear end of the link to clear the collar and the edge of the casing and the piston-rod will have reached substantially the position shown in Fig. 3, e., with its end projecting beyond the fronty face of the casing. The parts are vnovv inthey position shown in Fig. 3, that is, with the edge of the door lying in the plane' of the face of thejamb.v Since the lug',

15 projects a considerable distance beyond the edge'of the door and --also beyond the end of the vpiston-rod 7, the resilient extensible link 16 will form an obtuse angle with this `rod, and. the tension of the spring .12

v actingagainst this rodwill have a component force which will exert a tension on the link and projecting lug-to return the door to its closed'position';l `The effect ofthis force' f z.

will alsonbe increased since a better leverage l is obtainedy l on the door by using a lug-A A Whicl1f-projects a considerable distance be yond the pivotal point-'of the door; It will therefore be'seen that -the dangerl offthe' door being locked .in yits openpositioiras would occur .ifqthe'link 16 was lat vright anglesto or formed an acute anglewith the piston-rod, is substantially' eliminated@ For if the link and pistondod were at right angles, 'it is apparent that. there `Would be no so t at'the door will remain open, and if the link formed an acute angle with. the rod, then the' component of the force would exert its tension in a direction to lock the doory in its open position.-v After the spring 12 has been completely compressed and the end of the piston-rod projects slightly beyond the outer face of the casing, the resilient link 16 will be placedunder tension as the door approaches its fully open fposition. When .the door is released, the tension of the spring 16 will initiate the closing movement of the door and after the spring 16 resumes its normal position, it will act similar to a rigid link as has been previously described, while the spring 13 acts to complete' the closing of component 'forcein the direction of the linkI l the door. It will therefore be seen that the tension of springs 16 and 13 will be successively brought into action to effect the closing movement of the door, which will give a very eicient and practical form of door check.

Having described my invention,A I claim:

In a door check, a cylinder adapted to be inserted in the jamb of the door, a piston and a piston-rod connected thereto in said cylinder, a member adapted to be fastened to the edge of the door which abuts the face of the j amb when the door is closed, a resilient extensible link pivotally connecting said 

